It's tricky to know exactly what to add or change, I've seen people click through all the lights as if they knew exactly where they all were already, and I've watched (in dismay!) as people click furiously over the entire screen except on the hot-spot!
I did try implementing an electrical hum that changes depending on cursor proximity (you still might be able to hear it on one of the lights!) but didn't get working in a way I was happy with, it might be something i go back to! Just in general, sound is something I need to work more on.
As for interaction consistency I think part of the problem might be the size of this particular game, if it was a single screen/room you'd maybe expect everything to have a different mechanic attached? If it was longer and had loads more objects you'd be able to build up a familiarity with all the different types? As it stands this maybe falls awkwardly in the middle? I had a vision of having everything on screen being interactive in some way, that way it would be the narrative that would give objects significance rather than just the fact that they wobble, but I was pushing it just to get it done in the 4-months as it was!
Thanks again for playing and for all your feedback, I really appreciate it!
Cheers,
Nick